CN211851790U - Screen pipe and hydraulic fracturing device - Google Patents

Abstract

The utility model discloses a screen pipe and hydraulic fracturing device, this screen pipe includes: the pipeline comprises a plurality of pipeline bodies which are sequentially and coaxially connected, wherein each pipeline body comprises a first pipe wall and a second pipe wall which are connected, sieve holes are formed in the first pipe wall, the second pipe wall is a non-porous side wall, and the sieve holes are multiple groups, and the sieve holes are distributed at intervals along the axial direction of the pipeline bodies. The utility model discloses can be towards setting for the direction and spray high-pressure liquid to directional formation crack on the reservoir.

Description

Screen pipe and hydraulic fracturing device

Technical Field

The utility model relates to an oil gas exploitation technical field, in particular to screen pipe and hydraulic fracturing device.

Background

Hydraulic fracturing is an important technical means for increasing the production of oil and gas wells. The method comprises the steps of injecting high-pressure liquid into a well by using a ground high-pressure pump set, impacting a reservoir layer near a well wall by using the high-pressure liquid to generate cracks in the reservoir layer, releasing the stress of the reservoir layer, improving the permeability of the reservoir layer and increasing the yield of an oil-gas well.

When the related technology is used for hydraulic fracturing production increase, a sieve tube is arranged in a well, a plurality of rings of injection holes are circumferentially arranged on the sieve tube, then high-pressure liquid is injected into the sieve tube through a high-pressure pump set, and the high-pressure liquid can be injected to a reservoir near the well wall after passing through the injection holes, so that cracks are generated in the reservoir. The screen pipe can spray high-pressure liquid to the periphery along the circumferential direction to enable a reservoir to form cracks, but the screen pipe is sprayed towards a set direction, and the capability of forming cracks in a directional mode is poor.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides a screen pipe and hydraulic fracturing device can spray high-pressure liquid towards setting for the direction to directional formation crack on the reservoir. The technical scheme is as follows:

in a first aspect, an embodiment of the present invention provides a screen pipe, including: the pipeline body comprises a first pipe wall and a second pipe wall which are connected in the circumferential direction, a plurality of groups of sieve holes are arranged on the first pipe wall, the second pipe wall is a non-porous side wall, and the sieve holes are arranged along the axial direction of the pipeline body at intervals.

The utility model discloses in another kind of realization, every group the sieve mesh includes two at least sieve meshes, every group each in the sieve mesh is followed the axial spiral of pipeline body distributes.

The utility model discloses in another kind of implementation of embodiment, every group the sieve mesh includes straight hole, first inclined hole and second inclined hole, the central line of first inclined hole with the central line of second inclined hole respectively with the axis coplane of pipeline body, first inclined hole with the second inclined hole all include with the first end that the outer wall of pipeline body links to each other, the first end of first inclined hole apart from the distance of the one end of pipeline body is greater than the second end of first inclined hole is apart from the distance of the one end of pipeline body, first inclined hole with the second inclined hole all include with the second end that the inner wall of pipeline body links to each other, the first end of second inclined hole is apart from the distance of the one end of pipeline body is less than the second end of second inclined hole is apart from the distance of the one end of pipeline body.

The utility model discloses in another kind of implementation, the multiunit the sieve mesh includes follows the alternate interval arrangement's of axial of pipeline body injection punch combination and drainage punch combination, the aperture of the sieve mesh of injection punch combination is less than the aperture of the sieve mesh of drainage punch combination.

The utility model discloses in another kind of implementation of embodiment, the axial both ends of pipeline body all are equipped with limit structure, two that link to each other the pipeline body passes through limit structure joint, so that coaxial coupling the first pipe wall of pipeline body links to each other, coaxial coupling the second pipe wall of pipeline body links to each other.

The utility model discloses in another kind of implementation of embodiment, be located the limit structure of the one end of pipeline body is protruding, is located the limit structure of the other end of pipeline body is the recess.

The utility model discloses in another kind of implementation of embodiment, the arch is the circular arc board, the circular arc board with the pipeline body arranges with one heart, the recess is for following the open slot that the one end of pipeline body extended to the other end, the central angle that the circular arc board corresponds is not less than the central angle that the open slot corresponds.

The embodiment of the utility model provides an in another kind of implementation, protruding with the recess all has a plurality ofly, and is a plurality of protruding and a plurality of the recess is all followed the circumference interval distribution of pipeline body.

The utility model discloses in another kind of implementation of embodiment, the screen pipe still includes the ferrule, the inner wall of ferrule has the internal thread, the both ends of pipeline body are equipped with the external screw thread, two that link to each other the pipeline body passes through ferrule threaded connection.

In a second aspect, embodiments of the present invention provide a hydraulic fracturing apparatus comprising a screen as described above.

The embodiment of the utility model provides a beneficial effect that technical scheme brought includes at least:

the embodiment of the utility model provides a pipeline body in sieve pipe is equipped with the sieve mesh including continuous first pipe wall and second pipe wall on the first pipe wall, and the second pipe wall is the sclausura lateral wall, owing to only set up the sieve mesh on the partly pipe wall of pipeline body, avoids making high-pressure liquid to spray high-pressure liquid all around along circumference, therefore can control high-pressure liquid and spray from setting for the direction to realize directional injection in order to form fissured purpose. Meanwhile, the plurality of groups of sieve holes are axially arranged at intervals, so that high-pressure liquid can be sprayed to all positions of the coal mine reservoir along the axial direction of the sieve tube, cracks extending along the axial direction of the sieve tube can be formed on the coal mine reservoir, and because the plurality of groups of sieve holes are all positioned on the first tube wall, impact force can be provided to all positions of the coal mine reservoir along the axial direction of the sieve tube, so that cracks are formed on the reservoir along the axial direction of the sieve tube, and large-size cracks can be formed on the coal mine reservoir more easily in an oriented mode.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic structural view of a screen pipe according to an embodiment of the present invention;

fig. 2 is a schematic view showing the distribution of the screen holes on the screen pipe according to the embodiment of the present invention;

fig. 3 is a schematic cross-sectional view of a first inclined hole according to an embodiment of the present invention;

fig. 4 is a schematic cross-sectional view of a second inclined hole according to an embodiment of the present invention;

FIG. 5 is a right side view of a screen provided in FIG. 2;

FIG. 6 is a left side view of a screen provided in FIG. 2;

fig. 7 is a schematic connection diagram of a pipe body according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

The yield of the coal-bed gas well deployed in a certain range near the coal mine excavation roadway is high, and the reason is that the excavation roadway arranged in the coal mine reservoir releases the stress of the stratum around the excavation roadway, so that the permeability of the reservoir is improved. Therefore, in the related art, after the completion of the coal bed gas horizontal well, a screen pipe is usually put into the horizontal section of the horizontal well, and the coal mine reservoir in the horizontal section is subjected to large-diameter directional cave-making and crack formation through the screen pipe in a hydraulic fracturing mode, so that the stress of the coal mine reservoir is released, the permeability of the coal mine reservoir is improved, and the yield of the coal bed gas well is increased.

In the related art, the outer wall of the sieve tube used in the coal bed gas well is circumferentially provided with jet holes, and the sieve tubes are connected through threads and screw threads. Such screens have a poor ability to be jetted in a set direction to orient the formation of cracks.

Fig. 1 is a schematic structural diagram of a screen pipe according to an embodiment of the present invention. As shown in fig. 1, the screen includes: the pipeline comprises a plurality of pipeline bodies 1 which are sequentially and coaxially connected, wherein each pipeline body 1 comprises a first pipe wall 11 and a second pipe wall 12 which are connected in the circumferential direction, a plurality of groups of sieve holes 2 are arranged on the first pipe wall 11, each second pipe wall 12 is a non-porous side wall, and the plurality of groups of sieve holes 2 are arranged at intervals along the axial direction of the pipeline body 1.

Wherein, the side wall without holes is the side wall without through holes or other communication structures.

The embodiment of the utility model provides a pipeline body in sieve pipe includes first pipe wall and second pipe wall, and two lines of demarcation of first pipe wall and second pipe wall are along the axial extension of pipeline body, are equipped with the sieve mesh on the first pipe wall, and the second pipe wall is the sclausura lateral wall, owing to only set up the sieve mesh on the partly pipe wall of pipeline body, avoid making high-pressure liquid along circumference to spraying high-pressure liquid all around, therefore can control high-pressure liquid and spray from setting for the direction, thereby realize directional injection in order to form fissured purpose. Meanwhile, the plurality of groups of sieve holes are axially arranged at intervals, so that high-pressure liquid can be sprayed to all positions of the coal mine reservoir along the axial direction of the sieve tube, cracks extending along the axial direction of the sieve tube can be formed on the coal mine reservoir, and because the plurality of groups of sieve holes are all positioned on the first tube wall, impact force can be provided to all positions of the coal mine reservoir along the axial direction of the sieve tube, so that cracks are formed on the reservoir along the axial direction of the sieve tube, and large-size cracks can be formed on the coal mine reservoir more easily in an oriented mode.

The corresponding central angle of the arc on which the first tube wall 11 is located may be greater than 0 ° and not greater than 180 °. I.e. the first pipe wall 11 may be at most a semi-circular pipe wall.

In the embodiment, the sieve tube is formed by sequentially and coaxially connecting a plurality of pipeline bodies 1, the length of the sieve tube can be 600mm to 700mm, the outer diameter of the sieve tube can be 139.7mm to 177.8mm, and the wall thickness of the sieve tube is 7mm to 8 mm.

Alternatively, each set of holes 2 may comprise one or more holes 2 (at least two holes 2), and the distance between the holes 2 of each set may be 15cm to 25 cm. For example, as shown in fig. 1, when each group of the holes 2 includes only one hole 2, that is, a row of holes 2 distributed along the axial direction is formed on the first pipe wall 11 of the pipe body 1, the distance between two adjacent holes 2 may be 20 cm. When each group of sieve holes 2 comprises a plurality of sieve holes 2, fig. 2 is a schematic distribution diagram of the sieve holes on the sieve tube provided by the embodiment of the present invention. As shown in fig. 2, a plurality of rows of axially distributed screen holes 2 are formed on the first pipe wall 11 of the pipe body 1, and the distance between two adjacent sets of screen holes 2 may be 25 cm.

Alternatively, as shown in fig. 2, the individual holes 2 in each set of holes 2 are spirally distributed along the axial direction of the pipe body 1. In this embodiment, each group of the sieve holes 2 may include 3 to 9 sieve holes 2, for example, each group of the sieve holes 2 includes 6 sieve holes 2, and the 6 sieve holes 2 are arranged on the first pipe wall 11 at intervals by taking a spiral line as a track. The distribution mode of the group of sieve pores 2 is set to be axially and spirally distributed, so that the spraying range of the single group of sieve pores 2 is wider, cracks are easier to form on a coal mine reservoir, and the efficiency of hydraulic fracturing is improved.

In this embodiment, as shown in fig. 2, each group of screen holes 2 includes a straight hole 21, a first inclined hole 22 and a second inclined hole 23, and the center line of the first inclined hole 22 and the center line of the second inclined hole 23 are coplanar with the axis of the pipe body 1.

Fig. 3 is a schematic cross-sectional view of a first inclined hole according to an embodiment of the present invention. Fig. 4 is a schematic cross-sectional view of a second inclined hole according to an embodiment of the present invention. As shown in fig. 3 and 4, each of the first inclined hole 22 and the second inclined hole 23 includes a first end 2a connected to the outer wall of the pipe body 1, and each of the first inclined hole 22 and the second inclined hole 23 includes a second end 2b connected to the inner wall of the pipe body 1. The distance L1 from the first end 2a of the first inclined hole 22 to one end of the pipe body 1 is greater than the distance L2 from the second end 2b of the first inclined hole 22 to one end of the pipe body 1. The distance L3 from the first end 2a of the second inclined hole 23 to one end of the pipe body 1 is smaller than the distance L4 from the second end 2b of the second inclined hole 23 to one end of the pipe body 1. That is, the first inclined hole 22 and the second inclined hole 23 are respectively directed toward different ends of the duct body 1.

In this embodiment, it enables high-pressure liquid to spray along the radial outside of pipeline body 1 to set up sieve mesh 2 for straight hole 21, it enables a set of sieve mesh 2 to spray high-pressure liquid from the different directions to set up sieve mesh 2 for the inclined hole, thereby improve the spray range of singly organizing sieve mesh 2, simultaneously, because the spray direction of first inclined hole 22 and second inclined hole 23 is respectively towards the different both ends of pipeline body 1, just can spray high-pressure liquid along the relative direction in the axial direction through first inclined hole 22 and second inclined hole 23, with the further spray range of singly organizing sieve mesh 2 that increases, thereby form the crack on the colliery reservoir more easily, improve hydraulic fracturing's efficiency.

Illustratively, as shown in fig. 2, each group of screen holes 2 comprises 6 screen holes 2, two screen holes 2 positioned in the middle of the 6 screen holes 2 and two screen holes 2 positioned on two sides are inclined holes, and the rest two screen holes 2 in the 6 screen holes 2 are straight holes 21, i.e. the straight holes and the inclined holes in each group of screen holes can be alternately distributed, so that the spraying range of a single group of screen holes can be enlarged, and cracks can be formed on a coal mine reservoir conveniently. Wherein, the two inclined holes are respectively a first inclined hole 22 and a second inclined hole 23, that is, one of the two sieve holes 2 in the middle is the first inclined hole 22, and the other of the two sieve holes 2 in the middle is the second inclined hole 23; and one of the two sieve holes 2 on both sides is a first inclined hole 22, and the other of the two sieve holes 2 on both sides is a second inclined hole 23. As shown in fig. 3, the inclined hole angle α of the first inclined hole 22 is 68 ° to 78 °. As shown in fig. 4, the second inclined hole 23 has an inclined hole angle β of 63 ° to 73 °, wherein the inclined hole angle is an axial angle with respect to the pipe body 1.

When the coal mine reservoir is sprayed, coal particles and coal powder can be generated when the coal seam collapses, and the falling coal particles and coal powder easily block the spray hole, so that the sieve tube is not beneficial to high-efficiency work. In order to prevent the materials such as coal particles from blocking the sieve holes in the sieve tube. As shown in fig. 2, the multiple groups of sieve pores 2 in the sieve tube provided by the embodiment of the present invention may further include an injection hole group 25 and a drainage hole group 24 alternately arranged along the axial direction of the pipeline body 1, and the aperture of the sieve pore 2 of the injection hole group 25 is smaller than the aperture of the sieve pore 2 of the drainage hole group 24. In this embodiment, the aperture of the sieve holes 2 in the injection hole groups 25 is 8mm to 15mm, each injection hole group 25 may include 3 to 6 sieve holes 2, and the axial distance between the sieve holes 2 in two adjacent injection hole groups 25 is 35cm to 75 cm. The aperture of the screen holes 2 in the drainage hole groups 24 is 15mm to 30mm, each drainage hole group 24 can comprise 6 to 9 screen holes 2, and the axial distance between the screen holes 2 in two adjacent drainage hole groups 24 is 35cm to 75 cm. The mesh 2 in the jet hole group 25 has a small hole diameter, so that the flow velocity of the jetted water flow is high, the impact force provided for the coal mine reservoir is high, and the coal mine reservoir is easy to form cracks; and the aperture of the sieve mesh 2 in the drainage hole group 24 is large, and the sieve mesh can be used for absorbing coal particles and coal powder which can be generated when the coal bed collapses, so that the coal particles and the coal powder enter the sieve mesh 2 through the sieve mesh and are discharged, thereby avoiding the blockage of the sieve mesh 2 by the coal particles and the coal powder which fall off when the coal bed collapses, and enabling the sieve mesh to work efficiently.

Optionally, the axial two ends of the pipeline body are both provided with a limiting structure, and the two connected pipeline bodies are clamped through the limiting structures, so that the first pipe walls of the coaxially connected pipeline bodies are connected, and the second pipe walls of the coaxially connected pipeline bodies are connected. In this embodiment, when many pipelines are coaxial continuous, can be through setting up the limit structure at the both ends of pipeline body, make the first pipe wall of the pipeline body that links to each other, the second pipe wall of the pipeline body that links to each other to ensure many pipeline body and connect the back, many pipeline bodies still can follow same direction of settlement and spray high-pressure liquid, realize directional injection and form cracked purpose.

As shown in fig. 1 and 2, the limiting structure at one end of the pipe body 1 is a protrusion 31, and the limiting structure at the other end of the pipe body 1 is a groove 32. Through recess 32 and protruding 31 joint cooperation, can effectively avoid pipeline body 1 coaxial coupling back, the rotation appears between two pipeline bodies 1 to make the first pipe wall 11 of the pipeline body 1 that links to each other all the time link to each other, the second pipe wall 12 of the pipeline body 1 that links to each other, ensures that many pipeline bodies 1 connect the back, and many pipeline bodies 1 still can be along same direction of settlement injection high-pressure liquid, realizes directional injection and forms cracked purpose.

Optionally, as shown in fig. 1 and 5, the protrusion 31 is an arc plate, the arc plate is concentrically arranged with the pipe body 1, as shown in fig. 1 and 6, the groove 32 is an open groove extending from one end of the pipe body 1 to the other end, and a central angle corresponding to the arc plate is not smaller than a central angle corresponding to the open groove. Can be through the tip processing with pipeline body 1 directly in this embodiment in order to form the circular arc board, and can also form the open slot through the slotted mode at pipeline body 1's tip processing, make arch 31 and recess 32 be a body structure with pipeline body 1 like this, improve the stability after pipeline body 1 links to each other. Simultaneously, the central angle that the circular arc board corresponds is not less than the central angle that the open slot corresponds, for example, the central angle that the circular arc board corresponds can be greater than the central angle that the open slot corresponds by 1 to 5, makes the circular arc board closely cooperate with the open slot, prevents that two pipeline bodies 1 that link to each other break away from easily, improves connection stability.

Alternatively, the projections 31 and the grooves 32 are each plural, and the plural projections 31 and the plural grooves 32 are each distributed at intervals in the circumferential direction of the pipe body 1. The plurality of protrusions 31 and the plurality of grooves 32 cooperate to further enhance the connection stability between the pipe bodies 1, and prevent the two connected pipe bodies 1 from being easily separated.

Illustratively, as shown in fig. 5 and 6, the two end portions of the pipe body 1 are respectively provided with three protrusions 31 and three grooves 32, the protrusions 31 are circular arc plates, and the grooves 32 are open grooves. The central angles corresponding to the three arc plates are respectively 117 degrees, 37 degrees and 37 degrees, the central angles corresponding to the three open grooves are respectively 115 degrees, 35 degrees and 35 degrees, namely the central angles corresponding to the arc plates are 2 degrees larger than the central angles corresponding to the open grooves. After the three arc plates are matched with the three open grooves, the three arc plates can be tightly and stably clamped in the open grooves. Meanwhile, the length of the arc plate in the axial direction and the depth of the open slot are both 20mm, so that the arc plate and the open slot are just clamped and are seamless.

Alternatively, as shown in fig. 7, after the two connected pipeline bodies 1 are clamped by the groove 32 and the protrusion 31, the two connected pipeline bodies 1 can be clamped from the joint by the pipe clamp 4 on the screen. Wherein. The inner wall of the pipe hoop 4 is provided with internal threads, external threads are arranged at two ends of the pipeline body 1, and the two connected pipeline bodies 1 are connected through the pipe hoop 4 in a threaded mode. Two pipeline bodies 1 can be locked together by connecting the two pipeline bodies 1 through threads, and the two connected pipeline bodies 1 are prevented from being separated.

Alternatively, as shown in fig. 7, the outer wall of the pipe clamp 4 and the pipe wall of the pipe body 1 may be provided with pin holes 40, and after the pipe clamp 4 is screwed to connect the two pipe bodies 1, a pin is inserted through the pin holes on the outer wall of the pipe clamp 4 and the pipe wall of the pipe body 1 to lock the pipe clamp 4 on the pipe body 1, thereby further improving the connection stability.

When the sieve tube provided by the embodiment is used for directional injection to form cracks, after drilling is completed, the drilling tool is pulled out, a P110 steel grade D139.7mm sieve tube is put into a horizontal section of a gas well, a first pipeline body is put into a drill floor, a second pipeline body is lifted up to be clamped with a bulge of the first pipeline body through an open slot, then a pipe hoop screwed at the end of the second pipeline body is rotated by hydraulic tongs to go up and buckle, the torque is 3050-3800 N.m, the pipe hoop is tightly connected with an external thread on the first pipeline body, and after the pipe hoop slides to a pin hole, a pin is inserted to fix, so that the fixed connection of the two pipeline bodies is completed. In this way, connect all screen pipes and go into down, accomplish the horizontal segment and go into the back down, pass through the screw thread with last pipeline body and connect on the sleeve pipe, after then go into the well with the sleeve pipe is whole, through the orientation of going into screen hole on the TV observation screen pipe in the pit under the horizontal segment, according to the observation condition, rotate the sleeve pipe at the well head, behind the screen hole orientation settlement direction with the screen pipe, can carry out directional hydraulic jet and reform transform.

An embodiment of the utility model provides a hydraulic fracturing device, this hydraulic fracturing device include as before the screen pipe.

The above description is only an optional embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims (10)

1. A screen, comprising: the pipeline comprises a plurality of pipeline bodies (1) which are sequentially and coaxially connected, wherein each pipeline body (1) comprises a first pipe wall (11) and a second pipe wall (12) which are circumferentially connected, a plurality of groups of sieve holes (2) are formed in the first pipe wall (11), the second pipe wall (12) is a non-porous side wall, and the sieve holes (2) are arranged in multiple groups at intervals along the axial direction of the pipeline body (1).

2. The screen according to claim 1, wherein each set of the screen holes (2) comprises at least two screen holes, and each screen hole (2) in each set of the screen holes (2) is spirally distributed along the axial direction of the pipe body (1).

3. The screen according to claim 2, wherein each set of the screen holes (2) comprises a straight hole (21), a first inclined hole (22) and a second inclined hole (23), the centerlines of the first inclined hole (22) and the second inclined hole (23) being coplanar with the axis of the pipe body (1), respectively,

the first inclined hole (22) and the second inclined hole (23) each include a first end (2a) connected to an outer wall of the pipe body (1), a distance (L1) of the first end (2a) of the first inclined hole (22) from one end of the pipe body (1) is greater than a distance (L2) of the second end (2b) of the first inclined hole (22) from one end of the pipe body (1),

the first inclined hole (22) and the second inclined hole (23) each include a second end (2b) connected to an inner wall of the pipe body (1), and a distance (L3) from the first end (2a) of the second inclined hole (23) to one end of the pipe body (1) is smaller than a distance (L4) from the second end (2b) of the second inclined hole (23) to one end of the pipe body (1).

4. The screen according to claim 1, wherein the sets of holes (2) comprise groups of injection holes (25) and groups of drainage holes (24) alternately spaced in the axial direction of the pipe body (1), the holes (2) of the groups of injection holes (25) having a smaller diameter than the holes (2) of the groups of drainage holes (24).

5. The screen pipe according to claim 1, wherein the axial ends of the pipe bodies (1) are provided with limiting structures, and two connected pipe bodies (1) are clamped by the limiting structures, so that the first pipe walls (11) of the coaxially connected pipe bodies (1) are connected, and the second pipe walls (12) of the coaxially connected pipe bodies (1) are connected.

6. Screen according to claim 5, characterized in that the stop formations at one end of the pipe body (1) are protrusions (31) and the stop formations at the other end of the pipe body (1) are grooves (32).

7. The screen pipe according to claim 6, wherein the protrusions (31) are circular arc plates concentrically arranged with the pipe body (1), the grooves (32) are open grooves extending from one end to the other end of the pipe body (1), and central angles corresponding to the circular arc plates are not smaller than central angles corresponding to the open grooves.

8. The screen according to claim 7, wherein the protrusions (31) and the grooves (32) are each provided in plurality, and the protrusions (31) and the grooves (32) are each distributed at intervals in the circumferential direction of the pipe body (1).

9. The screen according to any one of claims 1 to 8, further comprising a collar (4), wherein the inner wall of the collar (4) is internally threaded, wherein both ends of the pipe body (1) are externally threaded, and wherein two connected pipe bodies (1) are threadedly connected by the collar (4).

10. A hydraulic fracturing device, characterized in that it comprises a screen according to any of claims 1 to 9.

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